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+# TargetFrameBuff v0.9.2
+
+Shows up to 32 upper-row icons and 16 lower-row debuffs on the default target frame.
+The existing 5-11-11-5 buff layout and 4-4-8 debuff layout are preserved.
+With ClassicAPI, harmful auras beyond the first 16 use available upper-row icons.
+
+## Installation
+
+Back up your existing TargetFrameBuff folder, then replace it with the TargetFrameBuff
+folder from the ZIP under Interface/AddOns. Restart the client or reload the UI.
+ClassicAPI is optional; version 1.17.3 was reviewed for this update.
+For working reverse sweeps and edges, use ClassicAPI 1.17.1 or newer.
+
+## Changes in v0.9.2
+
+- ClassicAPI 1.17.10+: use UNIT_AURA_DELTA for applications, removals, stack changes
+  and timing-only refreshes; no periodic aura polling on this path. Rebuild the
+  displayed snapshot to preserve filtered ordering and tooltip index alignment.
+- Older ClassicAPI retains the 0.5-second fallback below.
+- Hide native cooldown numbers on our sweeps to prevent duplicate text when
+  countdownForCooldowns is enabled; retain TargetFrameBuff's text controls.
+- Disable the sweep expiration flash and clear removed/disabled sweeps where supported.
+- Spellbook and player-pet changes refresh capability-dependent aura presentation.
+
+## Earlier changes (v0.9.1)
+
+- Refresh auras on target changes and target aura events, with a 0.5-second fallback.
+- Update only active countdowns every 0.2 seconds using cached expiration; stop
+  countdown work when none remain. Silent timing changes can take up to 0.5 seconds to appear.
+- Use GetAuraSlots with reusable buffers and UnitAuraBySlot where available; retain
+  the positional UnitAura fallback for older ClassicAPI. Slot IDs never survive a scan.
+- Display stack counts for upper-row buffs and overflow debuffs, with debuff-type borders.
+- Gold borders identify enemy buffs ClassicAPI says you or your pet can remove.
+- Optional reverse cooldown sweeps; countdown and stack text draw above the sweep.
+- Saved settings, a ClassicAPI AddOn Options panel, and vanilla-compatible slash commands.
+- Guard against an aura disappearing immediately before its tooltip opens.
+
+## Settings
+
+Run /tfb to open AddOn Options when available, or show command help otherwise.
+
+| Command | Action |
+| --- | --- |
+| /tfb timers on or off | Toggle countdown text (default on) |
+| /tfb highlight on or off | Toggle removable-buff borders (default on) |
+| /tfb sweeps on or off | Toggle cooldown sweeps (default off) |
+| /tfb size 6-20 | Set countdown font size (default 9) |
+| /tfb warning 0-30 | Seconds remaining at which text turns red (default 5) |
+| /tfb reset | Restore defaults |
+
+Without ClassicAPI the original native aura display remains available without timers,
+highlighting or sweeps. Settings are retained for use when ClassicAPI is installed.
+
+## Timing limitations
+
+ClassicAPI timings are best-effort. Unobserved applications and certain max-stack
+refreshes can have unknown expiration. Unknown or expired timers hide their text
+and sweep; the icon stays visible while the aura remains listed by the API.
+ClassicAPI controls aura ordering and puts your own auras first.
+
+## Validation
+
+17 automated scenarios passed using Lua 5.1 with a simulated WoW API; XML parses.
+This is not a live WoW 1.12/1.18.1 test or an exact Lua 5.0 runtime test.
+See VALIDATION.md for remaining in-game checks.
+
+Based on https://wow.curseforge.com/projects/project-949
+Original author: lua@lumpn.de (modified).
+
+
+Disable ShaguTweaks Unit Frames > Debuff Timer to prevent duplicate countdown text.